/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.activiti.engine.impl.bpmn.helper;

import java.util.List;

import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.delegate.event.ActivitiEvent;
import org.activiti.engine.delegate.event.ActivitiEventListener;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.impl.persistence.entity.EventSubscriptionEntity;
import org.activiti.engine.impl.persistence.entity.EventSubscriptionEntityManager;
import org.activiti.engine.impl.persistence.entity.MessageEventSubscriptionEntity;

/**
 * An {@link ActivitiEventListener} that throws a message event when an event is dispatched to it. Sends the message to the execution the event was fired from. If the execution is not subscribed to a
 * message, the process-instance is checked.
 * 

 * 
 */
public class MessageThrowingEventListener extends BaseDelegateEventListener {

  protected String messageName;
  protected Class<?> entityClass;

  @Override
  public void onEvent(ActivitiEvent event) {
    if (isValidEvent(event)) {

      if (event.getProcessInstanceId() == null) {
        throw new ActivitiIllegalArgumentException("Cannot throw process-instance scoped message, since the dispatched event is not part of an ongoing process instance");
      }

      EventSubscriptionEntityManager eventSubscriptionEntityManager = Context.getCommandContext().getEventSubscriptionEntityManager();
      List<MessageEventSubscriptionEntity> subscriptionEntities = eventSubscriptionEntityManager.findMessageEventSubscriptionsByProcessInstanceAndEventName(
          event.getProcessInstanceId(), messageName);
      
      for (EventSubscriptionEntity messageEventSubscriptionEntity : subscriptionEntities) {
        eventSubscriptionEntityManager.eventReceived(messageEventSubscriptionEntity, null, false);
      }
    }
  }

  public void setMessageName(String messageName) {
    this.messageName = messageName;
  }

  @Override
  public boolean isFailOnException() {
    return true;
  }
}
